ArticleChemistry (Weinheim an der Bergstrasse, Germany)2021
Solvent Induced Helix Folding of Defined Indolenine Squaraine Oligomers.
Article in Chemistry (Weinheim an der Bergstrasse, Germany), 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Synthesis, Structure, and Thin Film Optical Properties of a Chiral Benzothiazole-Derived Squaraine.Chemphyschem : a European journal of chemical physics and physical chemistry · 2026Article
- Time-resolved circular dichroism of excitonic systems: theory and experiment on an exemplary squaraine polymer.Chemical science · 2023Article
- Solvent Induced Helix Folding of Defined Indolenine Squaraine Oligomers.Chemistry (Weinheim an der Bergstrasse, Germany) · 2021Article
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8 authors.
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Abstract
A protecting group strategy was employed to synthesise a series of indolenine squaraine dye oligomers up to the nonamer. The longer oligomers show a distinct solvent dependence of the absorption spectra, that is, either a strong blue shift or a strong red shift of the lowest energy bands in the near infrared spectral region. This behaviour is explained by exciton coupling theory as being due to H- or J-type coupling of transition moments. The H-type coupling is a consequence of a helix folding in solvents with a small Hansen dispersity index. DOSY NMR, small angle neutron scattering (SANS), quantum chemical and force field calculations agree upon a helix structure with an unusually large pitch and open voids that are filled with solvent molecules, thereby forming a kind of clathrate. The thermodynamic parameters of the folding process were determined by temperature dependent optical absorption spectra.
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